Description
This example shows: how to read all the expanded data values from BUFR messages.
Source code
bufr_expanded.f90
! ! (C) Copyright 2005- ECMWF. ! ! This software is licensed under the terms of the Apache Licence Version 2.0 !which can be obtained at http://www.apache.org/licenses/LICENSE-2.0. ! ! In applying this licence, ECMWF does not waive the privileges and immunities granted to it by ! virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction. ! ! ! FORTRAN 90 Implementation: bufr_expanded ! ! Description: how to read all the expanded data values from BUFR messages. ! ! program bufr_expanded use eccodes implicit none integer :: ifile integer :: iret integer :: ibufr integer :: i integer :: count=0 integer(kind=4) :: numberOfValues real(kind=8), dimension(:), allocatable :: values call codes_open_file(ifile,'../../data/bufr/syno_1.bufr','r') ! The first bufr message is loaded from file, ! ibufr is the bufr id to be used in subsequent calls call codes_bufr_new_from_file(ifile,ibufr,iret) do while (iret/=CODES_END_OF_FILE) write(*,*) 'message: ',count ! We need to instruct ecCodes to expand all the descriptors ! i.e. unpack the data values call codes_set(ibufr,"unpack",1); ! Get the expanded data values call codes_get(ibufr,'numericValues',values) numberOfValues=size(values) do i=1,numberOfValues write(*,*) ' ',i,values(i) enddo ! Release the bufr message call codes_release(ibufr) ! Load the next bufr message call codes_bufr_new_from_file(ifile,ibufr,iret) ! Free array deallocate(values) count=count+1 end do ! Close file call codes_close_file(ifile) end program bufr_expanded
bufr_expanded.py
# Copyright 2005- ECMWF. # # This software is licensed under the terms of the Apache Licence Version 2.0 # which can be obtained at http://www.apache.org/licenses/LICENSE-2.0. # # In applying this licence, ECMWF does not waive the privileges and immunities # granted to it by virtue of its status as an intergovernmental organisation # nor does it submit to any jurisdiction. # # Python implementation: bufr_get_keys # # Description: how to read values of different type of keys from BUFR messages. # # from __future__ import absolute_import from __future__ import print_function import traceback import sys from eccodes import * INPUT = '../../data/bufr/syno_1.bufr' VERBOSE = 1 # verbose error reporting def example(): # open bufr file f = open(INPUT, 'rb') cnt = 0 # loop for the messages in the file while 1: # get handle for message bufr = codes_bufr_new_from_file(f) if bufr is None: break print("message: %s" % cnt) # we need to instruct ecCodes to expand all the descriptors # i.e. unpack the data values codes_set(bufr, 'unpack', 1) # ---------------------------------- # get all the expanded data values # ---------------------------------- key = 'numericValues' # get size num = codes_get_size(bufr, key) print(' size of %s is: %s' % (key, num)) # get values values = codes_get_array(bufr, key) for i in range(len(values)): print(" %d %.10e" % (i + 1, values[i])) cnt += 1 # delete handle codes_release(bufr) # close the file f.close() def main(): try: example() except CodesInternalError as err: if VERBOSE: traceback.print_exc(file=sys.stderr) else: sys.stderr.write(err.msg + '\n') return 1 if __name__ == "__main__": sys.exit(main())
bufr_expanded.c
/* * Copyright 2005- ECMWF. * * This software is licensed under the terms of the Apache Licence Version 2.0 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0. * * In applying this licence, ECMWF does not waive the privileges and immunities granted to it by * virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction. */ /* * C Implementation: bufr_expanded * * Description: how to read all the expanded data values from BUFR messages. * */ #include "eccodes.h" static void usage(const char* prog) { printf("usage: %s infile\n",prog); exit(1); } int main(int argc,char* argv[]) { char* filename = NULL; FILE* in = NULL; /* message handle. Required in all the ecCodes calls acting on a message.*/ codes_handle* h=NULL; double *values = NULL; size_t values_len=0; int i, err=0; int cnt=0; if (argc!=2) usage(argv[0]); filename=argv[1]; /* open bufr file */ in=fopen(filename,"rb"); if (!in) { printf("ERROR: unable to open file %s\n", filename); return 1; } /* loop over the messages in the bufr file */ while ((h = codes_handle_new_from_file(NULL, in, PRODUCT_BUFR, &err)) != NULL || err != CODES_SUCCESS) { if (h == NULL) { printf("Error: unable to create handle for message %d\n",cnt); cnt++; continue; } /* get the size of the values array*/ CODES_CHECK(codes_get_size(h, "numericValues", &values_len),0); printf(" number of expanded values: %lu\n", values_len); /* allocate array for data values */ values = (double*)malloc(values_len*sizeof(double)); /* get the expanded data values*/ CODES_CHECK(codes_get_double_array(h, "numericValues", values, &values_len),0); for(i = 0; i < values_len; i++) { printf(" %.10e\n",values[i]); } free(values); /* delete handle */ codes_handle_delete(h); cnt++; } fclose(in); return 0; }